PUSCH UCI Multiplexing Across Codewords by Highest MCS
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently performing signal transmission and reception procedures, particularly in managing uplink control information (UCI) multiplexing and demultiplexing across multiple codewords (CWs) with varying modulation and coding schemes (MCS) values.
Innovation Solution
A method is provided for multiplexing and demultiplexing uplink control information (UCI) by prioritizing codewords (CWs) with the highest modulation and coding scheme (MCS) value, where hybrid automatic repeat request-acknowledgment (HARQ-ACK) and channel state information (CSI) are handled differently based on priority and number of CWs, and using higher layer parameters for resource element configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UCI is multiplexed into multiple codewords with different MCS values, then the reliability of control information transmission is improved, but the complexity of multiplexing and demultiplexing operations increases
Solution Approach 1:
The patent changes the parameter of MCS value to determine the target codeword for UCI multiplexing. By selecting the codeword with the highest MCS value (or lowest index among those with highest MCS), the system adapts the multiplexing behavior based on the channel conditions represented by different MCS values, thereby improving reliability while maintaining manageable complexity through a clear selection rule
Solution Approach 2:
The patent applies different multiplexing strategies to different codewords based on their local characteristics (MCS values). Specifically, UCI is multiplexed into only one selected codeword (the one with highest MCS), while other codewords transmit only data, creating local quality differentiation that optimizes overall transmission reliability
2Device complexity
If UCI is multiplexed into only one codeword with highest MCS value, then the multiplexing complexity is reduced, but the resource utilization efficiency may deteriorate
Solution Approach 1:
The patent uses MCS value as a parameter to dynamically select which codeword receives UCI multiplexing. This parameter-based selection ensures that control information is placed in the codeword with the best channel conditions (highest MCS), optimizing resource utilization while keeping the selection rule simple and deterministic
Solution Approach 2:
The system performs preliminary selection of the target codeword based on MCS values before UCI multiplexing occurs. By pre-determining which codeword (the one with highest MCS, or lowest index among ties) will carry the UCI, the system avoids complex real-time decisions and simplifies the multiplexing process
3Reliability
If HARQ-ACK is repeatedly mapped on multiple CWs, then the reliability of acknowledgment transmission is improved, but the overhead of control information increases
Solution Approach 1:
The patent applies different mapping strategies to different types of UCI based on their local quality requirements. HARQ-ACK, which requires high reliability, is repeatedly mapped across multiple codewords, while CSI information is mapped only once to the selected codeword. This differentiated approach optimizes reliability for critical acknowledgments while controlling overall overhead
4Quantity of substance
If CSI is mapped once over multiple CWs, then the overhead of control information is reduced, but the reliability of channel state information transmission may deteriorate
Solution Approach 1:
The patent uses the MCS value parameter to determine the target codeword for CSI mapping. By selecting the codeword with the highest MCS value (indicating best channel conditions), the system ensures that CSI is transmitted on the most reliable path available, thereby maintaining reliability while reducing overhead compared to repeating CSI across all codewords
Data Source
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AI summary
A method by which a terminal transmits a signal in a wireless communication system, according to at least one of embodiments disclosed in the present specification, comprises: receiving downlink control information (DCI) for uplink scheduling; and transmitting a physical uplink shared channel (PUSCH) on the basis of the DCI, wherein on the basis that the transmission of the PUSCH is related to a 8-transmission port and comprises a plurality of codewords (CWs), first uplink control information (UCI) is multiplexed on one of the plurality of CWs, the one CW on which the first UCI is multiplexed has the highest modulation and coding scheme (MCS) value from among the plurality of CWs, the highest MCS value is on the basis that the number of CWs is 2 or more, and thus, from among CWs having the highest MCS value, a CW having the lowest CW index may be determined as the one CW on which the first UCI is multiplexed.